To inflate a ball without a pump, you’ll need a needle, syringe, straw, and air compressor (or hair dryer). Slide the needle into the ball and attach the syringe, then insert the straw into the syringe and connect it to the air source. Alternatively, use a bike pump adaptor. Inject water (optional) for lubrication, attach the pressure gauge, and inflate by pumping air. Use caution to avoid over-inflation and use gloves for protection.